If you have an iPhone, try disabling the "iMessage" functionality. When you send messages using iMessage, they messages go to an Apple server, then from there they are sent directly to the other person's phone if they are using an iPhone, but if they aren't then the messages are sent via SMS by the Apple servers indicating that they are being sent from your phone. This could easily be a problem on the Apple end and near impossible for AT&T to track down (or fix). Disabling iMessage and seeing if your problem is fixed would be a good place to start to try to get this resolved. If that works, then you know it's an Apple (or Apple specific to AT&T) problem. If that doesn't fix it, then you know the problem is either on your end (in your phone) or on the AT&T end.
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